Practice Problems Net F = ma

Directions: On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards.

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Question 1  What is the net force acting on a 2-kg mass if it is accelerating at a rate of 5 m/sec2?

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Question 2  What is the magnitude of the frictional force present if a 2-kg mass being pulled by a horizontal force of 9 newtons towards the right experiences an acceleration of 1.5 m/sec2?

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Question 3  A 2-kg mass experiences two vertical forces: 20.6 newtons pulling upward and 19.6 newtons pulling downward. What acceleration does the 2-kg mass undergo?

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Question 4  A 2-kg mass is being pulled towards the right with a rope that has a tension of 63 newtons at an angle of 40 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?

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Question 5  A 18-gram bullet travelling at 40 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 40 centimeters, what average resistive force did the tree exert upon it?